Is the vacuum portion of vacuum-assisted hydraulic brake systems required to have a warning device?

393.51: Warning signals, air pressure and vacuum gauges.

Question 2: Is the vacuum portion of vacuum-assisted hydraulic brake systems required to have a warning device?

Guidance: No. Only the hydraulic portion of vacuum-assisted hydraulic brake systems is...

Section 4.8.1.2 of 49 CFR part 395 subpart B, Appendix A requires that an electronic logging device (ELD) without a printer be designed so that “the display may be reasonably viewed by an authorized safety official without entering the commercial motor...

NOTE: This guidance reflects minor correction(s) (e.g., for grammar, typographical errors, or consistency) made on March 10, 2022.

FMCSA-HOS-ELD-TECH-395-FAQ55(2017-09-01)-CORR1

Question: Section 4.8.1.2 of 49 CFR...

Is the low pressure warning device required to activate before the tractor protection valve?

Section § 393.51: Warning signals, air pressure and vacuum gauges.

Question 1: Is the low pressure warning device required to activate before the tractor protection valve?

Guidance: No. Section 393.51 does not explicitly require the warning device to...

Self-Admission of Alcohol Abuse Off-duty: A driver self admits to a company official they are abusing alcohol off-duty only. Is this a violation of part 382, and does this trigger a DOT SAP evaluation?

Guidance on the consequences of a driver’s the self-admission of off-duty alcohol abuse.

Self-Admission of Alcohol Abuse Off-duty: A driver self admits to a company official they are abusing alcohol off-duty only. Is this a violation of part 382, and does this trigger a...

What is the focus of the HMSP Program Improvement Policy change?

FAQ 13: What is the focus of the HMSP Program Improvement Policy change?

Answer: The policy focuses specifically on the use of Safety Measurement System (SMS) data to continually monitor HMSP carrier performance and to determine when an HMSP...

Are the brakes on a vehicle towed in a driveaway-towaway operation or towed disabled vehicle required to be operable at all times?

Section § 393.48: Brakes to be operative.

Question 3: Are the brakes on a vehicle towed in a driveaway-towaway operation or towed disabled vehicle required to be operable at all times?

Guidance: Section 393.48(c) provides an exception to the requirement...

If a truck or truck tractor manufactured prior to July 25, 1980, and having 3 or more axles, has inoperable brakes on the front axle or some of the brake components are missing, would the vehicle be in violation of § 393.48?

Section § 393.48: Brakes to be operative.

Question 2: If a truck or truck tractor manufactured prior to July 25, 1980, and having 3 or more axles, has inoperable brakes on the front axle or some of the brake components are missing, would the vehicle be in violation...

How is the "Top 30%" OOS, Hazmat violations, and crash ratings calculated for an HMSP?

FAQ: 11 How is the "Top 30%" OOS, Hazmat violations, and crash ratings calculated for an HMSP?

Answer: The "top 30%" is a factor defined by examining ALL motor carriers registered for a USDOT Number. The factor establishes a threshold where in the total population of motor carriers, 30...

Do the permitting requirements apply to materials that have subsidiary hazards that come under the materials list, even if their primary hazard does not? Example: A Flammable Liquid, Class 3, is a subsidiary poison inhalation hazard.

FAQ 10: Do the permitting requirements apply to materials that have subsidiary hazards that come under the materials list, even if their primary hazard does not? Example: A Flammable Liquid, Class 3, is a subsidiary poison inhalation hazard.

Ansewr: Materials poisonous by inhalation...

Do the Hazardous Materials Safety Permit requirements apply to U.S. territories such as Puerto Rico?

FAQ 8: Do the Hazardous Materials Safety Permit requirements apply to U.S. territories such as Puerto Rico?

Answer: Yes. The HM Safety Permit requirements are enacted under the authority of the Hazardous Materials Law, which applies to U.S. Territories.